15 Steps to Disable Offsite Mail Relaying

When it comes to email servers, one of the most important security measures is to disable offsite mail relaying. This prevents unauthorized users from sending emails through your server, potentially using it for spam or other malicious activities. In this article, we'll outline the 15 steps you need to follow to disable offsite mail relaying and keep your email server secure.

Step 1: Understand Mail Relaying

Before we dive into the steps, it's important to understand what mail relaying is. Mail relaying occurs when an email server allows a third-party to send emails through it, even if the third-party is not an authorized user of the server. This can expose your server to abuse and potentially lead to blacklisting by email providers.

Step 2: Access Your Email Server

To disable offsite mail relaying, you'll need to access your email server's configuration settings. This typically involves logging into your server's control panel or using SSH to access the server directly.

Step 3: Locate the Mail Server Configuration

Once you've accessed your server, you'll need to find the mail server configuration files. These files are typically located in specific directories, depending on your server's operating system and the mail server software you're using.

Step 4: Identify Relaying Settings

Within the mail server configuration, you'll need to locate the settings related to relaying. These settings control who can send emails through your server and from which domains.

Steps 5-14: Configure Relaying Restrictions

【AOTsend Email API】：AOTsend is a Managed Email Service for sending transactional emails. Support Email Types: reminders, authentication, confirmations, notifications, verification codes, invoices, password resets, account activations, billing statements, two-factor authentication (2FA), and one-time passwords (OTP) emails, etc. $0.28 per 1000 Emails. 99% Delivery, 98% Inbox Rate.

You might be interested in:
Why did we start the AOTsend project, Brand Story?
What is a Managed Email API, How it Works?
Best 25+ Email Marketing Platforms (Authority,Keywords&Traffic Comparison)
Best 24+ Email Marketing Service (Price, Pros&Cons Comparison)
Email APIs vs SMTP: How they Works, Any Difference?

The next nine steps involve configuring the relaying restrictions on your email server. This typically includes:

1. Restricting relaying to authenticated users only.
2. Specifying which domains are allowed to relay through your server.
3. Blocking known spammers or blacklisted IP addresses.
4. Limiting the number of emails sent per hour or day to prevent abuse.
5. Enabling logs to track any unauthorized relaying attempts.
6. Configuring firewall rules to block unauthorized access to the SMTP port.
7. Testing the relaying restrictions to ensure they are working correctly.
8. Monitoring your server for any unusual activity or relaying attempts.
9. Regularly updating your server's software to patch any security vulnerabilities.
10. Documenting your relaying restrictions for future reference and troubleshooting.

Step 15: Regularly Review and Update Settings

Finally, it's important to regularly review and update your relaying settings to ensure they remain effective. As spammers and hackers evolve their techniques, it's crucial to stay vigilant and adapt your security measures accordingly.

By following these 15 steps to disable offsite mail relaying, you can significantly reduce the risk of your email server being abused for spam or malicious activities. Remember to regularly review and update your settings to maintain a secure and reliable email service.